The best replacement for calisthenics is weights.

The best alternatives to calisthenics are rated as following:
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★★  free weights
★★  cardio
★★  plyometrics
★  gym
★  crossfit
★  circuit training
★  lifting
  aesthetics
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  kettlebells

Your alternative for calisthenics is not listed? Suggest!
Speaking about calisthenics, one probably shouldn't forget about bodybuilding.

Other search terms related to calisthenics and their ratings are:
★★★★★ bodybuilding
You have in mind a companion for calisthenics and it is not yet here? Propose!



Google Trends

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calisthenics
weights
weight training